title: Radioactivity measurements in the aquatic environment using in-situ and laboratory gamma-ray spectrometry.
abstract: The in-situ underwater gamma-ray spectrometry method is validated by inter-comparison with laboratory method. Deployments of the spectrometer KATERINA on a submarine spring and laboratory measurements of water samples with HPGe detector were performed. Efficiency calibrations, Monte Carlo simulations and the Minimum Detectable Activity (MDA) estimations were realized. MDAs varied from 0.19 to 10.4 (lab) and 0.05 to 0.35 (in-situ) Bq/L, while activity concentrations differed from 7% (for radon progenies) up to 10% (for (40)K), between the two methods.
authors.affiliation: Hellenic Centre for Marine Research, Institute of Oceanography, P.O. Box 712, GR-19013 Anavyssos, Greece; National Technical University of Athens, Department of Physics, Zografou Campus, GR-15780 Athens, Greece.
authors.forename: G
authors.initials: G
authors.lastname: Eleftheriou
authors.forename: C
authors.initials: C
authors.lastname: Tsabaris
authors.forename: E G
authors.initials: EG
authors.lastname: Androulakaki
authors.forename: D L
authors.initials: DL
authors.lastname: Patiris
authors.forename: M
authors.initials: M
authors.lastname: Kokkoris
authors.forename: C A
authors.initials: CA
authors.lastname: Kalfas
authors.forename: R
authors.initials: R
authors.lastname: Vlastou
mesh_terms: D002138:Calibration; D003198:Computer Simulation; D006115:Greece; D006801:Humans; D057230:Limit of Detection; D009010:Monte Carlo Method; D011834:Radiation Monitoring / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D011868:Radioisotopes / Q000032:analysis; D012623:Seawater / Q000032:analysis; D013051:Spectrometry, Gamma / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D011868:Radioisotopes; D014875:Water Pollutants, Radioactive
keywords: Extended sources; HPGe; In-situ gamma-ray spectrometry; Inter-calibration; MCNP5; MDA